102Field DescriptionProtocol: (s) - spoofingThe link layer protocol of an interface is UP, but its link is an on-demandlink or not present at all.The protocol state of null or loopback interfaces might include thespoofing flag.Interface Abbreviated interface name.LinkPhysical link state of the interface:• UP—The interface is physically up.• DOWN—The interface is physically down.• ADM—The interface has been administratively shut down. Torecover its physical state, execute the undo shutdown command.• Stby—The interface is a backup interface.ProtocolLink layer protocol state of the interface:• UP.• DOWN.• UP (s)—The link of the interface is an on-demand link or notpresent at all. This state applies to null and loopback interfaces.DescriptionPartial or complete interface description set by using the descriptioncommand:• If you do not specify the description keyword for the displayinterface brief command, this field displays only the first 27characters of the interface description.• If you specify the description keyword for the display interfacebrief command, this field displays the complete interfacedescription.CauseCauses for the physical state of the interface to be Down:• Not connected—No physical connection exists (possibly becausethe L2TP negotiation fails or insufficient configuration exists totrigger L2TP negotiation).• Administratively—The interface was shut down by usingthe shutdown command. To restore the physical state of theinterface, use the undo shutdown command.display l2tp sessionUse display l2tp session to display information about L2TP sessions.Syntaxdisplay l2tp session [ statistics ]ViewsAny viewPredefined user rolesnetwork-adminnetwork-operatorParametersstatistics: Displays statistics for L2TP sessions.Examples# Display statistics for L2TP sessions.
